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HCMT Traction > Pneumatics & Brake System > Flashcards

Pneumatics & Brake System Flashcards

1
Q

What is Main Reservoir operating pressure? +-20

A

850-1000kPa

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2
Q

What is Emergency BC pressure?

A

280-460kPa

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3
Q

What is Maximum BC Pressure

A

250-380kPa

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4
Q

What is Holding BC Pressure

A

140-240kPa

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5
Q

What is Main Reservoir safety valve pressure?

A

1050kPa

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6
Q

What is Main Reservoir Safety Loop activation pressure?

A

600kPa

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7
Q

What is the ASU?

A

Air Supply Unit

Air Supply Unit Equipment Case
(not required to be inspected)

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8
Q

What does the ASU consist of?

A

Main air compressor

Air Dryers

Filters

Backup Compressor Governor

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9
Q

How many air compressors does a 7 car HCMT have?

A

Two

One in each Tc car

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10
Q

What does the Auxiliary Compressor do?

A

Raises pantographs when:

There is insufficient MR pressure

When car has been isolated from MR

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11
Q

Where is Auxiliary Compressor located?

A

DMp cars

If pantograph isolating cock is isolated on DMp car the pantograph will not be isolated. they will remain raised in the absence of MR air

Pg. 13

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12
Q

What Air Reservoirs are there on a HCMT

A

Main Reservoirs

Surge Reservoirs - supplies air to airbag, one for every air bag

Brake Supply reservoirs

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13
Q

What does the Brake Supply Reservoir do?

A

Supplies compressed air to the EP valves in the BCM to charge the BCs

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14
Q

How can pantographs be raised? (2)

A

MR pressure above 700kPa

Battery operatedAuxiliary compressor when insufficient MR pressure

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15
Q

How many pantograph ICs are there on DMp and Mp cars?

A

Saloon

and

Underframe

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16
Q

Which will isolate the pantograph on a DMp car?

A

Saloon

17
Q

How can you reset the Trip?

A

Trip Reset switch on OJT panel

Trip rest plunger on the front of the trip

18
Q

How do you isolate the Trip?

A

Turn Trip IC on B side between doors 2 and 4 on Tc car

and

Turn Trip Bypass switch in drivers cab to isolate

19
Q

If you isolate the Trip what comes into play?

A

Safety System Bypass Acknowledgement button

20
Q

What is the Post trip Speed Restriction?

A

Activates automatically after Trip has been activated.

restricts speed of train to 25kmh

Assists drivers to comply with extreme caution rule

21
Q

How long does the Post Trip Speed Restriction apply?

A

500 seconds

22
Q

How do you cancel Post Trip Speed Restriction?

A

Press Trip Speed button (under tamper cover) when relevant safe working conditions have been complied with

23
Q

What are the ICs in the BCM?

A

Brake Supply

BC End 2

BC End 1

Tread Scrubber (Tc only)

Park Brake (not Tc)

Sanders

24
Q

Where is the sanding equipment located?

A
25
Q

Where are Tread Scrubbers located?

A

Wheel 3 and 4 on Tc cars

26
Q

What do the Tread Scrubbers do?

A

Clean debris from wheel face to ensure proper conductivity of the track circuit

27
Q

What type of brakes does each car have?

Out of holding, emergency, parking, ED and EP

A
28
Q

Where is the BCU?

A

Inside the BCM

29
Q

What does the BCU do?

A

Controls the application and release of EP friction braking

30
Q

Where is the TCU?

A

Inside the VVVF Cabinet

31
Q

What does the TCU do?

A

Controls application of traction power and ED braking

32
Q

In emergency, what braking is used?

A

BCU takes over and friction EP braking only

33
Q

How does friction braking work?

A

Main Res. air

via BCM to

Brake Supply Reservoir

back through BCM to

BCs - compressed air pushes brake pads onto discs

34
Q

What ICs can isolate EP Friction brakes? (3)

A

Saloon Brake Supply IC (B06, door 4, every car)

BCM - BC ICs (one per bogie)

BCM - Brake Supply IC (one per car)

35
Q

What is the Holding Brake speed threshold?

A

0.5kmh

36
Q

When will emergency brake apply? (9)

A
37
Q

How do you reset safety loop?

A

Train stationary for more than 3 seconds

Reason for emergency brake application reset

MCH to MAX BRAKE

Reverser to NEUTRAL

38
Q

Where are the two Park Brake Isolating cocks?

A

Saloon - cabinet B07 near door 3

BCM IC

HCMT Traction (12 decks)

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